【odor 】 when you open the package for the first time, you will smell something. don't worry, it's the odor of natural latex. just put the mask on ventilated place, the smell will disperse. 【size】 free size. (one size fits most children and adults.) It does not come with the hat. 【sight】 if you feel that the sight of the mask is not good, just try to tear off the film on the lens to make the sight clear. 【after-sales】 if you are not satisfied with our products , just return them for a full refund.